#!/usr/bin/python

# Copyright (c) 2016, Renato Orgito <orgito@gmail.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations


DOCUMENTATION = r"""
module: spectrum_device
short_description: Creates/deletes devices in CA Spectrum
description:
  - This module allows you to create and delete devices in CA Spectrum U(https://www.ca.com/us/products/ca-spectrum.html).
  - Tested on CA Spectrum 9.4.2, 10.1.1 and 10.2.1.
author: "Renato Orgito (@orgito)"
extends_documentation_fragment:
  - community.general.attributes
attributes:
  check_mode:
    support: full
  diff_mode:
    support: none
options:
  device:
    type: str
    aliases: [host, name]
    required: true
    description:
      - IP address of the device.
      - If a hostname is given, it is resolved to the IP address.
  community:
    type: str
    description:
      - SNMP community used for device discovery.
      - Required when O(state=present).
    required: true
  landscape:
    type: str
    required: true
    description:
      - Landscape handle of the SpectroServer to which add or remove the device.
  state:
    type: str
    description:
      - On V(present) creates the device when it does not exist.
      - On V(absent) removes the device when it exists.
    choices: ['present', 'absent']
    default: 'present'
  url:
    type: str
    aliases: [oneclick_url]
    required: true
    description:
      - HTTP, HTTPS URL of the Oneclick server in the form V((http|https\)://host.domain[:port]).
  url_username:
    type: str
    aliases: [oneclick_user]
    required: true
    description:
      - Oneclick user name.
  url_password:
    type: str
    aliases: [oneclick_password]
    required: true
    description:
      - Oneclick user password.
  use_proxy:
    description:
      - If V(false), it does not use a proxy, even if one is defined in an environment variable on the target hosts.
    default: true
    type: bool
  validate_certs:
    description:
      - If V(false), SSL certificates are not validated. This should only be used on personally controlled sites using self-signed
        certificates.
    default: true
    type: bool
  agentport:
    type: int
    description:
      - UDP port used for SNMP discovery.
    default: 161
notes:
  - The devices are created inside the I(Universe) container of the specified landscape.
  - All the operations are performed only on the specified landscape.
"""

EXAMPLES = r"""
- name: Add device to CA Spectrum
  local_action:
    module: spectrum_device
    device: '{{ ansible_host }}'
    community: secret
    landscape: '0x100000'
    oneclick_url: http://oneclick.example.com:8080
    oneclick_user: username
    oneclick_password: password
    state: present


- name: Remove device from CA Spectrum
  local_action:
    module: spectrum_device
    device: '{{ ansible_host }}'
    landscape: '{{ landscape_handle }}'
    oneclick_url: http://oneclick.example.com:8080
    oneclick_user: username
    oneclick_password: password
    use_proxy: false
    state: absent
"""

RETURN = r"""
device:
  description: Device data when O(state=present).
  returned: success
  type: dict
  sample:
    {
      "model_handle": "0x1007ab",
      "landscape": "0x100000",
      "address": "10.10.5.1"
    }
"""

from socket import gethostbyname, gaierror
import xml.etree.ElementTree as ET

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.urls import fetch_url


def request(resource, xml=None, method=None):
    headers = {"Content-Type": "application/xml", "Accept": "application/xml"}

    url = f"{module.params['oneclick_url']}/spectrum/restful/{resource}"

    response, info = fetch_url(module, url, data=xml, method=method, headers=headers, timeout=45)

    if info["status"] == 401:
        module.fail_json(msg="failed to authenticate to Oneclick server")

    if info["status"] not in (200, 201, 204):
        module.fail_json(msg=info["msg"])

    return response.read()


def post(resource, xml=None):
    return request(resource, xml=xml, method="POST")


def delete(resource):
    return request(resource, xml=None, method="DELETE")


def get_ip():
    try:
        device_ip = gethostbyname(module.params.get("device"))
    except gaierror:
        module.fail_json(msg=f"failed to resolve device ip address for '{module.params.get('device')}'")

    return device_ip


def get_device(device_ip):
    """Query OneClick for the device using the IP Address"""
    resource = "/models"
    landscape_min = f"0x{int(module.params.get('landscape'), 16):x}"
    landscape_max = f"0x{int(module.params.get('landscape'), 16) + 0x100000:x}"

    xml = f"""<?xml version="1.0" encoding="UTF-8"?>
        <rs:model-request throttlesize="5"
        xmlns:rs="http://www.ca.com/spectrum/restful/schema/request"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.ca.com/spectrum/restful/schema/request ../../../xsd/Request.xsd">
            <rs:target-models>
            <rs:models-search>
                <rs:search-criteria xmlns="http://www.ca.com/spectrum/restful/schema/filter">
                    <action-models>
                        <filtered-models>
                            <and>
                                <equals>
                                    <model-type>SearchManager</model-type>
                                </equals>
                                <greater-than>
                                    <attribute id="0x129fa">
                                        <value>{landscape_min}</value>
                                    </attribute>
                                </greater-than>
                                <less-than>
                                    <attribute id="0x129fa">
                                        <value>{landscape_max}</value>
                                    </attribute>
                                </less-than>
                            </and>
                        </filtered-models>
                        <action>FIND_DEV_MODELS_BY_IP</action>
                        <attribute id="AttributeID.NETWORK_ADDRESS">
                            <value>{device_ip}</value>
                        </attribute>
                    </action-models>
                </rs:search-criteria>
            </rs:models-search>
            </rs:target-models>
            <rs:requested-attribute id="0x12d7f" /> <!--Network Address-->
        </rs:model-request>
        """

    result = post(resource, xml=xml)

    root = ET.fromstring(result)

    if root.get("total-models") == "0":
        return None

    namespace = dict(ca="http://www.ca.com/spectrum/restful/schema/response")

    # get the first device
    model = root.find("ca:model-responses", namespace).find("ca:model", namespace)

    if model.get("error"):
        module.fail_json(msg=f"error checking device: {model.get('error')}")

    # get the attributes
    model_handle = model.get("mh")

    model_address = model.find('./*[@id="0x12d7f"]').text

    # derive the landscape handler from the model handler of the device
    model_landscape = f"0x{int(model_handle, 16) // 0x100000 * 0x100000:x}"

    device = dict(model_handle=model_handle, address=model_address, landscape=model_landscape)

    return device


def add_device():
    device_ip = get_ip()
    device = get_device(device_ip)

    if device:
        module.exit_json(changed=False, device=device)

    if module.check_mode:
        device = dict(model_handle=None, address=device_ip, landscape=f"0x{int(module.params.get('landscape'), 16):x}")
        module.exit_json(changed=True, device=device)

    resource = f"model?ipaddress={device_ip}&commstring={module.params.get('community')}"
    resource += f"&landscapeid={module.params.get('landscape')}"

    if module.params.get("agentport", None):
        resource += f"&agentport={module.params.get('agentport', 161)}"

    result = post(resource)
    root = ET.fromstring(result)

    if root.get("error") != "Success":
        module.fail_json(msg=root.get("error-message"))

    namespace = dict(ca="http://www.ca.com/spectrum/restful/schema/response")
    model = root.find("ca:model", namespace)

    model_handle = model.get("mh")
    model_landscape = f"0x{int(model_handle, 16) // 0x100000 * 0x100000:x}"

    device = dict(
        model_handle=model_handle,
        address=device_ip,
        landscape=model_landscape,
    )

    module.exit_json(changed=True, device=device)


def remove_device():
    device_ip = get_ip()
    device = get_device(device_ip)

    if device is None:
        module.exit_json(changed=False)

    if module.check_mode:
        module.exit_json(changed=True)

    resource = f"/model/{device['model_handle']}"
    result = delete(resource)

    root = ET.fromstring(result)

    namespace = dict(ca="http://www.ca.com/spectrum/restful/schema/response")
    error = root.find("ca:error", namespace).text

    if error != "Success":
        error_message = root.find("ca:error-message", namespace).text
        module.fail_json(msg=f"{error} {error_message}")

    module.exit_json(changed=True)


def main():
    global module
    module = AnsibleModule(
        argument_spec=dict(
            device=dict(required=True, aliases=["host", "name"]),
            landscape=dict(required=True),
            state=dict(choices=["present", "absent"], default="present"),
            community=dict(required=True, no_log=True),  # @TODO remove the 'required', given the required_if ?
            agentport=dict(type="int", default=161),
            url=dict(required=True, aliases=["oneclick_url"]),
            url_username=dict(required=True, aliases=["oneclick_user"]),
            url_password=dict(required=True, no_log=True, aliases=["oneclick_password"]),
            use_proxy=dict(type="bool", default=True),
            validate_certs=dict(type="bool", default=True),
        ),
        required_if=[("state", "present", ["community"])],
        supports_check_mode=True,
    )

    if module.params.get("state") == "present":
        add_device()
    else:
        remove_device()


if __name__ == "__main__":
    main()
